I tried to run the offline examples groovy script today (Preferences -> JBoss Tools -> Project Examples -> Offline Support).
When I ran the script I saw a couple of errors along the way, see at the end of email. I was told that it could have to do with WFK 2.4 not being available in the online repo yet.
But ultimately the script failed this exception:
java.io.FileNotFoundException: /Users/rasp/jbossqa/runtimes/zip/offline/workDir/jboss-javaee6-webapp-blank-archetype/my-jboss-javaee6-webapp-blank-archetype

I had jboss nexus and http://maven.repository.redhat.com/techpreview/all/ in my settings.xml. After the script finished, the offline dir was 536M big.